Biology unit 2

Photosynthesis-
Needs- chlorophyll, CO2, water, sunlight
Produces- glucose and oxygen
Daytime- photosynthesis and respiration
Night time- no sunlight so just respiration
Carbon dioxide + water> glucose+oxygen
Respiration-
Glucose+oxygen > carbon dioxide+water+energy

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Photosynthesis

Needs- chlorophyll,CO2, water, sunlight

Produces- glucose and oxygen

Daytime- photosynthesis and respiration

Night time- no sunlight just respiration

Photosynthesis equation-

Carbon dioxide+water > glucose+oxygen

Respiration equation-

Glucose+oxygen >carbon dioxide+water+energy

So photosynthesis and respiration are opposites!

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Cell activity

A group of cells make up a tissue

A group of tissues make up an organ-heart

A group of organs make up a system- circulatory system

A group of system make up an organism- humans

Particles leave and enter the body by diffusion or osmosis

It requires no energy

During mitosis chromosomes become shorter and thicker. Mitosis is growth

Mieosis is for sexual reproduction

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Genetics and DNA

DNA- look like parents
Cell division- gametes (egg and sperm cell)
Nucleus- chromosomes with DNA inside
DNA - is a large complex molecule that carries genetic information that determines everything about
you for example... Hair colour, ever colour

Mitosis- divides into same DNA- identical to original
1. Parent cell
2. Copy them
3. Line them into the center of the cell
4. Separate into 2 cells

Meiosis-
Sensual reproduction, reproductive organs, pair up- 23 single pairs 1 from each parent

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